private void verifyPrerequisites() throws TransportException {
if (prereqs.isEmpty()) return;
final RevWalk rw = new RevWalk(local);
final RevFlag PREREQ = rw.newFlag("PREREQ");
final RevFlag SEEN = rw.newFlag("SEEN");
final List<ObjectId> missing = new ArrayList<ObjectId>();
final List<RevObject> commits = new ArrayList<RevObject>();
for (final ObjectId p : prereqs) {
try {
final RevCommit c = rw.parseCommit(p);
if (!c.has(PREREQ)) {
c.add(PREREQ);
commits.add(c);
}
} catch (MissingObjectException notFound) {
missing.add(p);
} catch (IOException err) {
throw new TransportException(uri, "Cannot read commit " + p.name(), err);
}
}
if (!missing.isEmpty()) throw new MissingBundlePrerequisiteException(uri, missing);
for (final Ref r : local.getAllRefs().values()) {
try {
rw.markStart(rw.parseCommit(r.getObjectId()));
} catch (IOException readError) {
// If we cannot read the value of the ref skip it.
}
}
int remaining = commits.size();
try {
RevCommit c;
while ((c = rw.next()) != null) {
if (c.has(PREREQ)) {
c.add(SEEN);
if (--remaining == 0) break;
}
}
} catch (IOException err) {
throw new TransportException(uri, "Cannot read object", err);
}
if (remaining > 0) {
for (final RevObject o : commits) {
if (!o.has(SEEN)) missing.add(o);
}
throw new MissingBundlePrerequisiteException(uri, missing);
}
}
private void markReachable(final Set<ObjectId> have, final int maxTime) throws IOException {
for (final Ref r : local.getAllRefs().values()) {
try {
final RevCommit o = walk.parseCommit(r.getObjectId());
o.add(REACHABLE);
reachableCommits.add(o);
} catch (IOException readError) {
// If we cannot read the value of the ref skip it.
}
}
for (final ObjectId id : have) {
try {
final RevCommit o = walk.parseCommit(id);
o.add(REACHABLE);
reachableCommits.add(o);
} catch (IOException readError) {
// If we cannot read the value of the ref skip it.
}
}
if (maxTime > 0) {
// Mark reachable commits until we reach maxTime. These may
// wind up later matching up against things we want and we
// can avoid asking for something we already happen to have.
//
final Date maxWhen = new Date(maxTime * 1000L);
walk.sort(RevSort.COMMIT_TIME_DESC);
walk.markStart(reachableCommits);
walk.setRevFilter(CommitTimeRevFilter.after(maxWhen));
for (; ; ) {
final RevCommit c = walk.next();
if (c == null) break;
if (c.has(ADVERTISED) && !c.has(COMMON)) {
// This is actually going to be a common commit, but
// our peer doesn't know that fact yet.
//
c.add(COMMON);
c.carry(COMMON);
reachableCommits.add(c);
}
}
}
}
private void recreateCommitGraph() throws IOException {
final RevWalk rw = new RevWalk(db);
final Map<ObjectId, ToRewrite> toRewrite = new HashMap<ObjectId, ToRewrite>();
List<ToRewrite> queue = new ArrayList<ToRewrite>();
final BufferedReader br =
new BufferedReader(new InputStreamReader(new FileInputStream(graph), Constants.CHARSET));
try {
String line;
while ((line = br.readLine()) != null) {
final String[] parts = line.split("[ \t]{1,}");
final ObjectId oldId = ObjectId.fromString(parts[0]);
try {
rw.parseCommit(oldId);
// We have it already. Don't rewrite it.
continue;
} catch (MissingObjectException mue) {
// Fall through and rewrite it.
}
final long time = Long.parseLong(parts[1]) * 1000L;
final ObjectId[] parents = new ObjectId[parts.length - 2];
for (int i = 0; i < parents.length; i++) {
parents[i] = ObjectId.fromString(parts[2 + i]);
}
final ToRewrite t = new ToRewrite(oldId, time, parents);
toRewrite.put(oldId, t);
queue.add(t);
}
} finally {
br.close();
}
pm.beginTask("Rewriting commits", queue.size());
final ObjectWriter ow = new ObjectWriter(db);
final ObjectId emptyTree = ow.writeTree(new Tree(db));
final PersonIdent me =
new PersonIdent("jgit rebuild-commitgraph", "rebuild-commitgraph@localhost");
while (!queue.isEmpty()) {
final ListIterator<ToRewrite> itr = queue.listIterator(queue.size());
queue = new ArrayList<ToRewrite>();
REWRITE:
while (itr.hasPrevious()) {
final ToRewrite t = itr.previous();
final ObjectId[] newParents = new ObjectId[t.oldParents.length];
for (int k = 0; k < t.oldParents.length; k++) {
final ToRewrite p = toRewrite.get(t.oldParents[k]);
if (p != null) {
if (p.newId == null) {
// Must defer until after the parent is rewritten.
queue.add(t);
continue REWRITE;
} else {
newParents[k] = p.newId;
}
} else {
// We have the old parent object. Use it.
//
newParents[k] = t.oldParents[k];
}
}
final Commit newc = new Commit(db);
newc.setTreeId(emptyTree);
newc.setAuthor(new PersonIdent(me, new Date(t.commitTime)));
newc.setCommitter(newc.getAuthor());
newc.setParentIds(newParents);
newc.setMessage("ORIGINAL " + t.oldId.name() + "\n");
t.newId = ow.writeCommit(newc);
rewrites.put(t.oldId, t.newId);
pm.update(1);
}
}
pm.endTask();
}